diff --git a/perl-xCAT/xCAT/Schema.pm b/perl-xCAT/xCAT/Schema.pm
index 638656206..7f329962d 100644
--- a/perl-xCAT/xCAT/Schema.pm
+++ b/perl-xCAT/xCAT/Schema.pm
@@ -1019,7 +1019,7 @@ routes => {
 	routename => 'Name used to identify this route.',
 	net => 'The network address.',
 	mask => 'The network mask.',
-	ifname => 'The interface name of the management node facing the gateway.',
+	ifname => '(optional) The interface name of the management node facing the gateway.',
 	gateway => 'The gateway that routes the ip traffic from the mn to the nodes. It is usually a service node.',
 	comments => 'Any user-written notes.',
 	disable => "Set to 'yes' or '1' to comment out this row.",